Certificates
Compliance certificates	RoHS
Certification	FCC, CE
Features
Product colour	Metallic
Logistics data
Harmonized System (HS) code	85369010
Operational conditions
Minimum operating temperature	0 °C
Maximum operating temperature	70 °C
Operating temperature (T-T)	0 - 70 °C
Storage temperature (T-T)	-40 - 80 °C
Operating relative humidity (H-H)	10 - 90%
Storage relative humidity (H-H)	5 - 90%
Packaging content
Quantity per pack	1 pc(s)
Packaging data
Package width	38 mm
Package depth	207 mm
Package height	38 mm
Package weight	110 g
User guide
Performance
SFP transceiver type	Fiber optic
Maximum data transfer rate	1250 Mbit/s
Interface type	mini-GBIC/SFP
Fiber optic connector	LC (UPC)
Fiber cable diameters supported (core/cladding)	50/125,62.5/125 µm
Maximum transfer distance	550 m
Wavelength	850 nm
Networking standards	IEEE 802.3z
Single-mode fiber (SMF) supported
Multi-mode fiber (MMF) supported
Power
Input voltage	3.3 V
Weight & dimensions
Width	55.4 mm
Depth	13.7 mm
Height	12.9 mm

The TP-Link TL-SM311LM is a Gigabit SFP module for use in network switches, enabling transmission over multi-mode fibre (MMF). It extends the transmission range in existing LAN networks and connects to managed or web-smart switches to establish fibre optic connections. The module is compatible with the mini-GBIC/SFP standard and supports 1000Base-SX technology with a maximum data transfer rate of 1250 Mbit/s. It is specifically designed for use in industrial and enterprise environments where stable and reliable fibre optic communication is required.

Applications
This module is suitable for applications requiring network range extension over several kilometres, such as in surveillance systems, factories, parks, or campus networks. It enables the connection of network components over long distances without compromising data integrity. The use of fibre optic cables offers higher bandwidth and lower signal attenuation compared to copper cables, which is particularly advantageous over long distances.

Features and Specifications in Detail
The module features an LC (UPC) connector, designed for connection with multi-mode fibre cables with core diameters of 50/125 µm or 62.5/125 µm. The maximum transmission distance is 550 metres for 50/125 µm and 275 metres for 62.5/125 µm fibre. The wavelength is 850 nm, typical for 1000Base-SX modules. The module supports full-duplex transmission, enabling simultaneous bidirectional data transfer. It is plug-and-play capable and can be installed in compatible switches without additional configuration. LED indicators display the module’s operational status, simplifying network problem diagnosis.

Technology Explained Simply
The module operates according to the IEEE 802.3z standard and is designed for use in commercial environments. It is powered via the switch’s internal power supply at 3.3 V, eliminating the need for an external power source. The hot-plug capability allows the module to be inserted or removed while the switch is powered on, facilitating maintenance and configuration during operation. Digital diagnostics monitoring (DDM) enables monitoring of parameters such as receive level, temperature, and supply voltage to optimise operation and detect faults early.

Compatibility and Accessories
The module is compatible with all Omada switches as well as other network devices supporting SFP slots for 1000Base-SX. It is specifically designed for use with multi-mode fibre cables and does not support single-mode fibre. Compatibility with other modules or devices not supporting the SFP-MSA standard is not guaranteed.

Installation and Mounting
Installation is performed by simply inserting the module into the SFP slot of the switch. No additional configuration or tools are required. The LED indicators provide immediate feedback on operational status. The operating temperature range is 0 °C to 70 °C, and the storage temperature range is -40 °C to 80 °C. Relative humidity during operation is 10–90 %, and during storage 5–90 %.

Operational Advantages
The module provides a reliable and cost-efficient solution for extending network range. The use of fibre optic cables enables high data rates over long distances without signal degradation. Hot-plug capability and plug-and-play installation reduce downtime during maintenance. The integrated DDM function supports network monitoring and optimisation. The module is housed in a metallic enclosure, ensuring a robust and long-lasting design.

Certifications and Environment
The module complies with FCC, CE, and RoHS certifications, confirming conformity with European and American safety and environmental standards. The product colour is metallic, giving the module a professional appearance. Dimensions are 55.4 mm (width) × 13.7 mm (depth) × 12.9 mm (height). The product is designed for use in commercial and industrial environments and provides high operational reliability under normal environmental conditions.

Scope of Delivery
The module is delivered in packaging containing the device and a user manual. Packaging dimensions are 38 mm (width) × 207 mm (depth) × 38 mm (height), and the package weight is 110 g. The quantity per package is 1 piece.